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. 1992 Jul;58(7):2237–2244. doi: 10.1128/aem.58.7.2237-2244.1992

Biodegradation of mixtures of substituted benzenes by Pseudomonas sp. strain JS150.

B E Haigler 1, C A Pettigrew 1, J C Spain 1
PMCID: PMC195761  PMID: 1637161

Abstract

Pseudomonas sp. strain JS150 was isolated as a nonencapsulated variant of Pseudomonas sp. strain JS1 that contains the genes for the degradative pathways of a wide range of substituted aromatic compounds. Pseudomonas sp. strain JS150 grew on phenol, ethylbenzene, toluene, benzene, naphthalene, benzoate, p-hydroxybenzoate, salicylate, chlorobenzene, and several 1,4-dihalogenated benzenes. We designed experiments to determine the conditions required for induction of the individual pathways and to determine whether multiple substrates could be biodegraded simultaneously. Oxygen consumption studies with whole cells and enzyme assays with cell extracts showed that the enzymes of the meta, ortho, and modified ortho cleavage pathways can be induced in strain JS150. Strain JS150 contains a nonspecific toluene dioxygenase with a substrate range similar to that found in strains of Pseudomonas putida. The presence of the dioxygenase along with multiple pathways for metabolism of substituted catechols allows facile extension of the growth range by spontaneous mutation and degradation of mixtures of substituted benzenes and phenols. Chlorobenzene-grown cells of strain JS150 degraded mixtures of chlorobenzene, benzene, toluene, naphthalene, trichloroethylene, and 1,2- and 1,4-dichlorobenzenes in continuous culture. Under similar conditions, phenol-grown cells degraded a mixture of phenol, 2-chloro-, 3-chloro, and 2,5-dichlorophenol and 2-methyl- and 3-methylphenol. These results indicate that induction of appropriate biodegradative pathways in strain JS150 permits the biodegradation of complex mixtures of aromatic compounds.

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Selected References

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